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(Perciformes, Sciaenidae) from the Amazon and Essequibo River Basins and Redescription of Petilipinnis Grunniens

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(Perciformes, Sciaenidae) from the Amazon and Essequibo River Basins and Redescription of Petilipinnis Grunniens Papéis Avulsos de Zoologia MUSEU DE ZOOLOGIA DA UNIVERSIDADE DE SÃO PAULO ISSN 0031-1049 PAPÉIS AVULSOS DE ZOOL., S. PAULO 42(7):169-181 14.VI.2002 PETILIPINNIS, A NEW GENUS FOR CORVINA GRUNNIENS SCHOMBURGK, 1843 (PERCIFORMES, SCIAENIDAE) FROM THE AMAZON AND ESSEQUIBO RIVER BASINS AND REDESCRIPTION OF PETILIPINNIS GRUNNIENS LILIAN CASATTI1 ABSTRACT Petilipinnis, new genus, is proposed for Corvina grunniens Schomburgk, from the Amazon and Essequibo river basins. It is distinguishable from other Sciaenidae genera with the exception of Menticirrhus, by the presence of only one spine in the anal fin. From Menticirrhus, Petilipinnis differs by the morphology of the swimbladder and the number of dorsal fin soft rays. Also a redescription of Petilipinnis grunniens is presented. KEYWORDS: Petilipinnis, freshwater Sciaenidae, Petilipinnis grunniens. INTRODUCTION The Sciaenidae (croakers, drums, pescadilhos, pescadas, and corvinas) is one of the largest perciform families in number of species and distribution, including approximately 78 genera and 287 species worldwide, in coastal and brackish waters of temperate and tropical areas of the world (Chao, 1986). The genera Aplodinotus Rafinesque, Pachypops Gill, Pachyurus Agassiz, Plagioscion Gill, and Boesemania Trewavas are restricted to freshwater. 1 Laboratório de Ictiologia, Departamento de Biologia, FFCLRP-USP, Av. Bandeirantes, 3900, 14040-901, Ribeirão Preto, SP, Brazil. E-mail: [email protected]. Trabalho recebido para publicação em 16.XI.1999 e aceito em 08.II.2001. 170 Papéis Avulsos de Zoologia Aplodinotus occurs in North America; Pachypops, Pachyurus, and Plagioscion in South America, from northern Venezuela to the lowlands of Argentina (Chao, 1978); and Boesemania in Thailand, Vietnam, Cambodia, and Sumatra (Kottelat et al., 1993). Furthermore, Dendrophysa Trewavas, Johnius Bloch and Nibea Jordan & Thompson, from the Indo-Pacific, can occasionally enter freshwater (Kunio Sasaki, personal communication). The genus Corvina was proposed by Cuvier (1829) and the type species, C. nigra, was subsequently designed by Gill (1861). According to Trewavas (1966), Corvina is a pre-occupied name in Aves, and moreover is a synonym of Sciaena Linnaeus, 1758. Since Corvina is an invalid name in the zoological literature, Corvina grunniens Schomburgk cannot presently be placed in any valid genus. Notwithstanding this, the diagnosable external character (the presence of one anal spine) and the locality (Essequibo and Amazon River basins), among other characters pointed out in the discussion, show that this species cannot be assigned to any other genus in the Sciaenidae. A new genus, Petilipinnis, is here proposed for Corvina grunniens with a redescription of Petilipinnis grunniens (Schomburgk). METHODS Counts and measurements were taken with calipers with 0,1 mm of resolution and follow Hubbs & Lagler (1958); lateral-line scales counts include the perforated scales to the hypural joint. Subunits of body are expressed as proportions of standard length (SL), except the anal fin spine length; the anal fin spine length and subunits of the cephalic region are expressed as proportions of head length (HD). One specimen was cleared and stained according the method proposed by Taylor & Van Dyke (1985), and compared with cleared and stained specimens of Pachypops and Pachyurus. The list of the material examined comprises the locality, including the country, state or department, river and complement, institutional number, number of specimens, in parentheses the standard length in mm, collection date and collector. The examined specimens are deposited in the following institutions: AMNH, American Museum of Natural History; ANSP, Academy of Natural Sciences of Philadelphia; FMNH, Field Museum of Natural History; MZUSP, Museu de Zoologia da Universidade de São Paulo; and INPA, Instituto Nacional de Pesquisas da Amazônia. Petilipinnis, new genus Type species: Corvina grunniens Schomburgk, 1843: 136 (type not found). Vol. 42(7):169-181 171 DIAGNOSIS OF THE GENUS Petilipinnis is distinguishable from all other Sciaenidae genera, with the exception of Menticirrhus, by having only one spine in the anal fin. From Menticirrhus it differs by having 29 to 32 soft dorsal-fin rays and a carrot- shaped swimbladder with an anterior pair of short branched appendages (fig. 3 a); in Menticirrhus the dorsal fin has 18 to 27 soft rays and the swimbladder, when present, is reduced to a simple vesicle. A single species is included in the genus: Petilipinnis grunniens (Schomburgk, 1843). Etymology: From the Latin petilus (adjective), slender, and pinna (substantive), fin, in allusion to the slender morphology of the anal fin. Gender feminine. Petilipinnis grunniens (Schomburgk, 1843) (Figs. 1-2) Corvina grunniens Schomburgk, 1843: 136, pl. 2 (original description; type locality: British Guiana [Guyana], Essequibo River). Pachypops grunniens Jordan & Eigenmann, 1889: 414 (name only); Eigenmann, 1912: 476 (freshwater fishes of British Guiana [Guyana]). Pachyurus grunniens Chao, 1978: 43 (Western Atlantic Sciaenidae). MATERIAL EXAMINED 63 specimens. Guyana: Essequibo: Essequibo River, upstream Kurupukari, ANSP 176038, 10(33.9-102.5), 27.I.1997, W.G. Saul col.; Essequibo River, upstream Maipure, ANSP 176039, 5(22.6-51.7), 02.II.1997, W.G. Saul col.; Essequibo River, ANSP 176040, 1(50.7), 31.I.1997, W.G. Saul col.; ANSP 176041, 1(77.5), 26.I.1997, D.Torres col.; ANSP 176042, 2(90.3-107.7), 25.I.1997, W.G. Saul col.; ANSP 176043, 1(252.0), 27.I.1997, W.G. Saul col.; AMNH 215024, 5(49.2-69.6), 1935, A.S. Pinkus col.; AMNH 220463, 1(140.9), 09.XII.1937, T. Holden col.; Essequibo River, Kartabo, AMNH 220423, 1(34.0), 12.IV.1924, Beebe col.; AMNH 220438, 4(62.7-95.6), 05.VI.1924, Beebe col.; Potaro River, Tumatumari, FMNH 53957, 1(132.7), 1908, C.H. Eigenmann col.; Unorowo River, branch of Essequibo River, AMNH 220483, 2(176.0-202.4), 28.XII.1937, T. Holden col.; Mazzaruni-Potaro: Cuyuni River, AMNH 73005, 1(155.6), 18.VIII.1983, Schmidt col.; AMNH 72961, 2(123.6-127.4), 12.VIII.1983, Schmidt col.; AMNH 72063, 1(97.7), 06.VIII.1982, Schmidt col.; Venezuela: Bolivar: Cuyuni River, ANSP 167919, 1(38.6), 23.I.1991, 172 Papéis Avulsos de Zoologia S. Schaefer col.; Brazil: Amazonas: Rio Uatumã, INPA 10433, 1(192.0), 17.IV.1983, Equipe de Ictiologia INPA col.; INPA 2724, 1(266.0), IX.1985, M. Jegu col.; INPA 2725, 2(225.0-245.0), VII.1985, M. Jegu col.; INPA 12918, 2(187.1-215.2), 31.I.1985, Equipe de Ictiologia INPA col.; Rio Pitinga, Cachoeira Quarenta Ilhas, INPA 3302, 1(278.0), 12.X.1989, F. Martinho col.; Pará: Rio Trombetas, INPA 3293, 1(198.0), 17.IV.1985, E. Ferreira col.; INPA 10425, 1(166.0), V.1988, Equipe de Ictiologia INPA col.; INPA 10420, 3(98.1-117.5), 1 Cleared and Stained,10.XI.1981, Equipe de Ictiologia INPA col.; Rio Trombetas, Cachoeira Porteira, INPA 10418, 1(132.1), V.1988, Equipe de Ictiologia INPA col.; INPA 10425, 1(166.0), V.1988, Equipe de Ictiologia do INPA col.; Rio Trombetas, Cachoeira Vira- Mundo, INPA 3263, 1(139.3), 09.X.1985, Equipe de Ictiologia INPA col.; Rio Fresco, São Félix do Xingu, MZUSP 35995, 1(275.5), VIII.1983, M. Petrere col.; Rio Tocantins, INPA 10415, 2(97.0-110.6), 10.XI.1981, Equipe de Ictiologia INPA col.; INPA 10429, 1(217.0), 08.XI.1981, Equipe de Ictiologia INPA col.; INPA 10414, (102.2-114.6), I.1981, Equipe de Ictiologia INPA col.; INPA 10436, 1(200.6), XI.1980, Equipe de Ictiologia INPA col.; MZUSP 14673, 1(83.7), 17.IX.1970, Expedição Permanente à Amazônia col. Rondônia: Rio Machado, INPA 12916, 1(222.7), 04.VI.1984, G. Mendes col. DESCRIPTION Morphometric and meristic data are presented in Table I. Body relatively elongate, sub-cylindrical; greatest body depth at origin of dorsal fin. Dorsal profile of body convex. Ventral profile flattened from prepelvic region to anal fin. Ventral profile of caudal peduncle slightly convex. Head pointed in profile. Mouth inferior and small (4.2-6.9 in HD). Lower jaw not extending beyond vertical through anterior edge of eye. Teeth small, villiform, and in single bands in both jaws. Snout pointed, typically longer than horizontal diameter of eye; nostrils of each side close together, anterior circular and posterior crescent-shaped. Eye elliptical, horizontal diameter longer than vertical, 3.0-3.6 in head length. Laterosensory canal segments clearly visible externally, passing through lachrymals, suborbitals, preopercle, and lower jaw. Preopercle margin slightly serrate. Gill rakers short and slender. Scales ctenoid, except on snout and preopercle, where they are cycloid. Lateral line curved until the anterior third of second dorsal fin, extending to the hind margin of the caudal fin. Small ctenoid scales on proximal 2/3 of dorsal fin, proximal 3/4 of pelvic fin, proximal 3/4 of caudal fin, and proximal 1/2 of pectoral and anal fins. Vol. 42(7):169-181 173 First dorsal fin with 10 spines, first very small; a notch present between first and second dorsal fins; second dorsal with an spine. Posterior tip of pectoral- fin not reaching the posterior tip of pelvic-fin when depressed. Anal-fin spine slender, most commonly 3.3-3.6 times in head length. Caudal fin rhombic in lateral view. Swimbladder carrot-shaped with an anterior pair of short branched appendages, its posterior end slightly surpassing anus (fig. 3 a). Color in alcohol: Head and dorsal 3/4 of body light tan, with small brown irregular spots, concentrated anteriorly. Lower 1/4 of body silvery. First dorsal fin light tan with dark edges and second dorsal fin with numerous small brown spots forming irregular stripes. Pectoral, pelvic, anal, and caudal fins light yellow, slightly silvery. Juveniles are light tan with brown spots smaller than eye on body. Distribution: Known from rivers of the Amazon River basin in Brazil, and Cuyuni and Essequibo River basins in Guyana (fig.
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